mSPAMOLAN AND BAHAMAN ANNULARIIDAE 151 



Spaced axial riblets, of which 266 are present on the last whorl. In addi- 

 tion to the axial riblets, the whorls are marked by spiral cords, of which 

 19 are present on the last part of the last turn. The junction of the axial 

 ribs and spiral cords forms well-defined nodules, which give to the sur- 

 face of the shell a granulose appearance. Suture narrowly channeled. 

 Periphery well rounded. Base marked by the continuation of the axial 

 ribs and seven spiral cords, which are a little stronger than those on the 

 spire. The umbilicus is very broad and bordered on its outer margin by 

 a very strong keel, and within by 10 additional strong keels. Aperture cir- 

 cular; peristome double, the inner slightly exserted; the outer very 

 broadly flaringly expanded, pale yellow, with scarcely an indication of 

 rays, marked by concentric lines. Operculum with central nucleus and 

 decidedly oblique lamella. 



The type (U.S.N.M. No. 504095) was collected by Dr. W. L. Abbott 

 on the trail from Samana to Rio San Juan, Samana Peninsula. It has 5 

 whorls and measures : Height, 7.0 mm. ; greater diameter, 9.8 mm. ; lesser 

 diameter, 7.0 mm. 



I have given a full description of this subspecies, since I do not have 

 specimens of typical adolphi for a comparative description. 



U.S.N.M. No. 504096 contains 206 topotypes from the same source. 



U.S.N.M. No. 504097 contains i specimen collected by Dr. W. L. 

 Abbott at Laguna. 



ABBOTTEIiliA 808UAENSIS, new species 



Plate 26, Figures 11-13 



Shell small, heUcoid, pale brown, with the peristome paler and slightly 

 rayed. Nuclear whorls 1.7, well rounded, minutely granulose. Post- 

 nuclear whorls marked by poorly developed axial ribs of which 121 

 are present on the last turn. These axial ribs become a little more em- 

 phasized on the summit of the whorls. In addition to the axial ribs, the 

 whorls are marked by strong spiral cords, of which 12 are present be- 

 tween the summit and periphery of the last whorl. Suture deeply chan- 

 neled. Periphery well rounded. Base well rounded and marked by the 

 continuation of the axial ribs and eight spiral cords. The umbilicus is 

 moderately broadly open and its wall bears eight spiral cords and the 

 continuation of the axial ribs. Aperture circular; peristome double, the 

 inner rather strongly exserted ; the outer moderately broad, a little wider 

 on the outer lip than on the inner and somewhat auriculated at the 

 posterior angle and marked by concentric lines. Operculum with central 

 nucleus, bearing a decidedly elevated, almost vertical lamella. 



The type (U.S.N.M. No. 336768) was collected by Dr. W. L. Abbott 

 at Sosiia, 16 miles east of Puerto Plata, Dominican Republic. It has 

 4.6 whorls and measures : Height, 4.6 mm. ; greater diameter 7.0 mm. ; 

 lesser diameter, 5.9 mm. 



U.S.N.M. No. 336765 contains 703 topotypes from the same source. 



